#include <iostream>
#include <string>
#include <vector>
#include <functional>

void print(const std::string &str,int num){
    std::cout<<str<<num<<std::endl;
}

int main(){
    using Task=std::function<void()>;
    std::vector<Task> arry;
    arry.push_back(std::bind(print,"hello",10));
    arry.push_back(std::bind(print,"leihou",20));
    arry.push_back(std::bind(print,"nihao",30));
    arry.push_back(std::bind(print,"bitejiuyeke",40));

    for(auto &f:arry){
        f();
    }
    return 0;
}